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Expanding die and method of shaping containers

a beverage container and expansion die technology, applied in the direction of shaping tools, manufacturing tools, other domestic articles, etc., can solve the problems of increasing the manufacturing time and hence the cost associated with producing beverage containers, the container body cannot be easily incorporated into the inline process, and the transition is not adequately discriminated or differentiated. , to achieve the effect of uniform diameter and minimal transition

Active Publication Date: 2011-05-03
ALCOA CORP CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention provides a process for making containers with expanded sides using an expansion die. The process involves expanding a container stock to a larger diameter and then shaping it to accept a lid. The expansion die has a work surface that progressively expands the container stock to create an expanded diameter portion. The invention also includes a die system with multiple expansion dies to achieve a gradual increase in the container stock diameter. The technical effects of the invention include improved container manufacturing efficiency and aesthetics."

Problems solved by technology

As the containers are produced substantially to an identical shape, they can not adequately be discriminated or differentiated from one another by their appearance.
More specifically, molding of container bodies increases manufacturing time and hence the cost associated with producing the beverage containers.
Molding is not easily incorporated into an inline process, therefore requiring that the molding step be separate from the in line process of forming container bodies using drawn and iron technology.
A further disadvantage is that the degree of expansion that may be provided using molding is substantially limited, especially when taking into account that drawn and ironed cans have undergone intensive metal working, i.e., drawing and ironing operations, and may no longer retain adequate ductility so that a conspicuous contour to give the desired effects is attainable without resulting in rupture of the can or metal fracture.

Method used

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  • Expanding die and method of shaping containers
  • Expanding die and method of shaping containers
  • Expanding die and method of shaping containers

Examples

Experimental program
Comparison scheme
Effect test

example 1

Expansion of 2.069″ Internal Diameter

[0047]A five die expansion system was utilized to expand the diameter of a portion of a container stock having a 0.0088 inch thick sidewall of Aluminum Association (AA) 3104 from an original internal diameter of 2.069″ to a final internal diameter on the order of 2.615″. The expansion represents an increase of approximately 24% in the container stock's diameter without the formation of Lueder's lines or metal tears. The first expansion die providing an expansion of approximately 9%; the second and third expansion die each providing an expansion of approximately 4.5%; and a fourth and fifth expansion die each providing an expansion of approximately 3.0%.

example 2

Expansion of 2.603″ Internal Diameter

[0048]A three die expansion system was utilized to expand the diameter of a portion of the container stock of a 211 can having a 0.0056 inch thick sidewall of Aluminum Association (AA) 3104 from an original internal diameter of 2.603″ to a final internal diameter on the order of 2.860″. In each of the three expansion die the degree of expansion increased by 3% per expansion step.

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Abstract

The present invention provides an expansion die for manufacturing containers including a work surface including a progressively expanding portion and a land portion; and an undercut portion positioned following the land portion of the work surface. The present invention further provides a process for manufacturing shaped containers including providing a container stock having a first diameter; expanding at least a portion of the container stock to a second diameter with at least one expansion die; and forming an end of the container stock to accept a container lid.

Description

FIELD OF THE INVENTION[0001]This invention relates to expansion dies for shaping beverage containers.BACKGROUND OF THE INVENTION[0002]Beverage containers for various soft drinks or beer are generally formed by drawn and iron technology (i.e., the DI can), in which the container trunk (or side wall portion) and the container bottom are integrally formed by drawing and ironing a metallic sheet, such as an aluminum alloy sheet or a surface-treated steel sheet.[0003]In the industry, these beverage containers are produced massively and relatively economically to substantially an identical shape. As the containers are produced substantially to an identical shape, they can not adequately be discriminated or differentiated from one another by their appearance. As the beverage containers are manufactured massively and relatively economically, there is a strong desire among beverage manufacturers for economical beverage containers with unique configurations to help differentiate their product...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B21D22/21B21D22/00B21D51/00
CPCB21D22/025B21D51/2646B21D39/20Y10S72/715B21D51/26B65D1/12B21D37/00
Inventor MYERS, GARY L.FEDUSA, ANTHONYDICK, ROBERT E.
Owner ALCOA CORP CENT
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